You would make a line from one corner to another corner than if you want to know the measure of it you would take a ruler and measure it.
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If you a shape and you want to know how many diagonals it has, count it from corner to corner.
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Divide the length of the diagonal of a square by 1.4142 (which is the square root of 2) to find the length of a side. Similarly, to find the length of the diagonal of a square, multiply the length of a side by 1.4142.
If you know the length of the sides but not the diagonal, you can use the Pythagorean Theorem.
The answer depends on what information is provided: the volume, total surface area, principal diagonal, minor diagonal, etc.
By the Pythagorean Theorem, the diagonal is the hypotenuse of the right triangle formed by the diagonal and the two included sides. c2 = a2 + b2 so the diagonal is the square root of the sum of the squares of the rectangle's length and width. Example : for a rectangle 4 x 3, the diagonal is sqrt(32 + 42) = sqrt (25) = 5
Use Pythagoras' therorem to find the diagonal of the rectangle which is 12 times the sq rt of 13